888-2406-002 6-5
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
6.4.1 3 Strike Routine
There are 2 faults in the transmitter that will initiate what is called a 3 strike routine.
They are:
• RFL_PWR - VSWR greater than 1.5:1
• ISO_BZ_OT - The predicted temperature of R9 on the “B” Z-Plane Isolation
board is greater than 130
o
C.
• Strike 1 - When any of the above fault conditions is met, the transmitter output is
muted (DAC_APC_REF is brought to zero) for 3 seconds (6 seconds for trans-
mitters with a Single Phase power supply). At the end of the 3 (or 6) seconds the
transmitter power is slowly ramped back up and a 10 second timer is started.
• Strike 2 - If another fault is detected before the 10 seconds is up, the transmitter
will again mute for 3 (or 6) seconds, start the 10 second timer again and slowly
ramp the power up again.
• Strike 3 - A third fault detected within this 10 seconds will cause the transmitter
to be muted until the operator gives the transmitter an ON command (High or
Low), locally or by remote. If the cause of the fault is still present, the transmitter
will simply repeat the 3 strikes and mute again.
NOTE:
If no faults occur during either of the 10 second time periods, then the
strike counter is reset and will allow 3 more strikes before muting the
transmitter.
The slow ramp up in power after a strike should allow the foldback controls to limit
the transmitter power output before the fault thresholds are reached again. The slow
power ramps are designed to allow the transmitter to operate at the maximum
possible power level without over-dissipating the isolation resistors or exposing the
transmitter to excessive reflected power. This would mean that there would be a
fault in the log but it would be inactive and the transmitter would be in a foldback
condition.
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